Title	Patent Filing Date
Cutter tool for use in a boring head	1974-10-29
Guiding means for boring bar	1975-03-05
Earth boring bit with means for conducting heat from the bit's bearings	1974-06-28
Portable earth boring machine	1974-11-29
Portable earth boring machine	1974-11-29
Self-propelled percussive machine for boring holes	1974-11-14
Trepanning and boring tool	1975-02-11
Steerable rock boring head for earth boring machines	1974-08-14
Boring apparatus provided with drill bits freely rotatable around their own axis	1974-10-04
Boring apparatus	1974-09-16
Boring machine for work pieces of large diameter	1974-03-05
Shallow-hole kerf boring machine with auger on side-arm elevating assembly	1974-07-24
Boring bar assembly improvement	1974-10-29
Tunnel boring machine with dual support members	1974-01-02
Boring bar with removable and indexable cutting insert	1975-08-04
Boring bar or the like	1975-01-27
Tunneling machine for boring a side drift	1975-01-29
Boring tool for working bores of small diameter	1974-10-17
Arrangement for keeping tools of the drilling, milling, boring type etc. in readiness for use on machine tools	1974-05-15
Continuous tunnel boring machine and method	1974-08-05
Tooth loading for earth boring bits	1975-04-28
Boring apparatus	1975-06-09
Device for mounting attachment on horizontal boring machine	1975-06-04
Guide means for boring bars	1974-09-12
Disc cutting unit for use on rock boring machines	1973-05-31
Machine boring tool	1974-08-30
Boring bar with removable and indexable cutting insert	1974-11-07
Self-boring bushing device	1975-10-14
Continuous roof support system for tunnel boring	1975-07-25
High velocity, low-friction boring tool	1976-03-08
No dialing boring head, sizing blocks for standard sizes, shims and spacers with blocks for intermediate sizes, optional pin holes for quick change	1975-04-28
Earth boring method employing high powered laser and alternate fluid pulses	1974-11-20
Earth boring auger	1975-12-15
Method and apparatus for establishing the drilling line of an overhead boring machine	1975-02-03
Conical boring tool	1975-10-20
Block boring tool	1975-10-24
Disc cutting units for use on rock boring machines	1975-07-22
Adjustable boring bar provided with hard metal shifting tip for metal working	1975-05-02
Portable boring bar	1975-10-07
Boring mill and milling device with a tool magazine	1974-11-14
Method of forming a wood boring tool	1976-04-19
Portable earth boring machine with steering head	1974-05-20
Boring rod extension with two counter-rotating boring tool carriers	1974-11-26
Self-boring fastener and methods of use thereof	1975-04-11
Boring rig alignment apparatus and method	1975-07-30
Method for connecting electrical conductors for electric earth boring means	1975-12-05
Pneumatic hammer-auger earth boring apparatus	1976-01-12
Boring tool with variable extension	1975-10-20
Adjustable tool holder for boring bar	1976-06-03
Sealing between relatively rotating members in boring apparatus	1976-05-19